Narragansett, Rhode Island. Narragansett is a town in Washington County, Rhode Island, United States. The population was 15,868 at the 2010 census. However, during the summer months the town's population more than doubles to near 34,000. The town is colloquially known as Gansett.
While there is not first or last date to fertilize blueberry bushes, the general rule of thumb is to fertilize blueberries in the spring before their leaves have grown in. This is so that the blueberry fertilizer has time to penetrate the soil and make it to the roots of the blueberry bush before it enters active growth. You should be fertilizing blueberries once a year. Typically, they do not need fertilizing more often than this.
For the raspberries I just use 10-10-10 just when they start pushing new growth...maybe somebody else will have more suggestions. For the blueberries the advice to wait a year is wrong. What you want to do is fertilize them monthly or even weekly but with very very small amounts. Find some ammonium sulfate and use 1/2 tsp per gallon weekly and after a month or so switch to 1 tsp per gallon of water weekly. Just make sure when you fertilize them they are not dry.